Hydrogen: fix keyed loads with string keys

test/mjsunit/generic-monorphic-keyed-load.js

Index: test/mjsunit/generic-monorphic-keyed-load.js
diff --git a/test/mjsunit/regress/regress-334708.js b/test/mjsunit/generic-monorphic-keyed-load.js
similarity index 89%
copy from test/mjsunit/regress/regress-334708.js
copy to test/mjsunit/generic-monorphic-keyed-load.js
index f0291bbdab61128baad9df89457d045b66644f1b..43889460f622209a1e56a92293ce7cff25c197ab 100644
--- a/test/mjsunit/regress/regress-334708.js
+++ b/test/mjsunit/generic-monorphic-keyed-load.js
@@ -27,16 +27,20 @@
 
 // Flags: --allow-natives-syntax
 
-function foo(x, y) {
-  return Math.floor(x / y);
+
+var o = {
+  "foo": "bar",
 }
 
-function bar(x, y) {
-  return foo(x + 1, y + 1);
+function get(obj, key) {
+  return obj[key];
 }
 
-foo(16, "4");
+get(o, "foo");
+get(o, "foo");
+get(o, "foo");
+
+%OptimizeFunctionOnNextCall(get);
+get(o, "foo");
 
-bar(64, 2);
-%OptimizeFunctionOnNextCall(bar);
-bar(64, 2);
+assertOptimized(get);